8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 12170 Comm: syz.6.1605 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813cec10>] lr : [<813cec00>] psr: 60000013 sp : e0171d30 ip : e0171d30 fp : e0171d54 r10: 82b25910 r9 : 00000003 r8 : 840cbb40 r7 : e0171d90 r6 : 840cbb40 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1773c r1 : 00000001 r0 : 813ce880 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85b57bc0 DAC: fffffffd Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 840cbb40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe0170000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 840cbb40 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xe0170000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xe0170000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.6.1605 (pid: 12170, stack limit = 0xe0170000) Stack: (0xe0171d30 to 0xe0172000) 1d20: 823f1538 840cbb40 829d1c34 829d1c34 1d40: 81e17bfc 840cbb84 e0171d8c e0171d58 813cac9c 813ceaa8 200000c0 00000000 1d60: e0171d7c 200000c0 840cbb40 b5403587 200000c0 83abc800 40946400 00000003 1d80: e0171e4c e0171d90 813c67e8 813caba0 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f27 00000002 00000004 00000006 00000005 00000005 00000004 1dc0: 00000007 54c6cff3 000000fd 00000002 00008401 00000001 00000001 00000006 1de0: 00000101 00000000 00000892 0000a418 40000001 00000005 0000caa3 00000000 1e00: 20001e5b 00000000 00000e66 00000004 00000008 00004086 00000000 fffffff8 1e20: 00000000 d05bbf87 00000000 8634e900 840cbb40 200000c0 200000c0 83abc800 1e40: e0171f14 e0171e50 813c77b4 813c66f4 00000000 00000000 00000000 d05bbf87 1e60: 00000000 00000000 824625b4 0000005f 83c91be8 840cbb70 841d12dc 83abc800 1e80: e0171ee4 e0171e90 807a7d9c 8079e194 00000064 00000001 00000000 e0171eac 1ea0: 85a7fcd0 8342f440 00006400 0000000b e0171ea0 00000000 00000000 d05bbf87 1ec0: 8634e900 40946400 200000c0 200000c0 8634e900 00000003 e0171ef4 e0171ee8 1ee0: 807a7ebc d05bbf87 e0171f14 40946400 00000000 8634e901 200000c0 8634e900 1f00: 00000003 83abc800 e0171fa4 e0171f18 80578f00 813c71e4 ecac8b10 83abc800 1f20: e0171f3c e0171f30 81a61300 81a611d0 e0171f54 e0171f40 8025c484 8028d914 1f40: e0171fb0 40000000 e0171f84 e0171f58 802229ec 8025c440 00000000 8281cfb4 1f60: e0171fb0 0014ced0 ecac8b10 80222940 00000000 d05bbf87 e0171fac 00000000 1f80: 00000000 00316308 00000036 8020029c 83abc800 00000036 00000000 e0171fa8 1fa0: 80200060 80578ddc 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f5a0bc 1fe0: 76f59ec0 76f59eb0 00019294 00132970 60000010 00000003 00000000 00000000 Call trace: [<813cea9c>] (parport_attach) from [<813cac9c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:840cbb84 r5:81e17bfc r4:829d1c34 [<813cab94>] (comedi_device_attach) from [<813c67e8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83abc800 r7:200000c0 r6:b5403587 r5:840cbb40 r4:200000c0 [<813c66e8>] (do_devconfig_ioctl) from [<813c77b4>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83abc800 r7:200000c0 r6:200000c0 r5:840cbb40 r4:8634e900 [<813c71d8>] (comedi_unlocked_ioctl) from [<80578f00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c71d8>] (comedi_unlocked_ioctl) from [<80578f00>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c71d8>] (comedi_unlocked_ioctl) from [<80578f00>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c71d8>] (comedi_unlocked_ioctl) from [<80578f00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83abc800 r9:00000003 r8:8634e900 r7:200000c0 r6:8634e901 r5:00000000 r4:40946400 [<80578dd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0171fa8 to 0xe0171ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f5a0bc 1fe0: 76f59ec0 76f59eb0 00019294 00132970 r10:00000036 r9:83abc800 r8:8020029c r7:00000036 r6:00316308 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction